92 
Records of the Geological Survey of India. 
[vol. IV. 
entirely the form of Pelt. Arduennense, Orb., with the single difference, that the ribs, which 
are, as long as they exist on the shell, divided into two branches nearly from the umbilical 
margin, are stronger and less numerous. Growing larger each rib is produced at the point, 
where it passes from the lateral to the siphonal side, into a prominent spine, from which the 
rib proceeds regularly over the siphonal side. In yet larger specimens a second row of 
spines appears also near the umbilical margin, the ribs becomo then nearly obsolete, and 
fragments are only distinguishable from Pelt.perarmat/um by the peculiar flattening of the 
ribs which connect the corresponding tubercles of both the umbilical and perispherical rows. 
Peltoceras bidens, Waagen, n. sp. Very much resembling the former species, but dis¬ 
tinguishable by the ribs being mostly undivided and very coarse ; they arc provided on the 
siphonal side with two indistinct tubercles. Large specimens have more distant spines than 
Pelt, smirugosum. 
Peltoceras monacanthus, Waagen, n. sp. Allied to Pelt, hybonotum, Opp., but with 
only one row of spines near the umbilical margin, and less distinct granulations on both 
sides of the median excavation on the siphonal side. 
The genus Aspidoceras, though represented in our Museum by a good many fragments, 
has furnished only two determinable species ; they are : 
Aspidoceras iphicerma, Opp. (red, fine sandy iron rock, N. of Dhosa). 
„ Wynnei, Waagen, n. sp. (coarse sandy iron rock, at Toodoora, S, of 
Boojooreo, together with TTapl. tomephorum) in the highest layer 
containing Ammonites). 
The other fragments are from the coarse iron sandstone of the Katrol range, and appear 
to be referable to Asp. iphicerum , Opp., and bhiodnm , Quenst. 
Aspidoceras Wynnei, Waagen, u. sp. Most nearly allied to Asp. Apennimcum, Zitt., 
but the outer row of tubercles stronger, and more numerous; and in general mere irregular 
than in the species just quoted. 
The genus Stephanoceras is extremely rich in forms in the Kutcb Jura, but notwith¬ 
standing this, it only represents there a single group, the Macroeephali. Several sub-divi¬ 
sions among the species belonging to the genus can be distinguished, facilitating the deter¬ 
mination of the species themselves. I distinguish (1) a group of species, allied to the true 
St. macrocephalum, (2) a group of species with bent ribs on the siphonal side, which replace 
in India the group of St. goverianum, &c., of Europe, (3) the group of St. modiolare, repre¬ 
sented in India but by a single species. 
To the first group belong the following species: 
Stephanoceras macrocephalum, Schloth. (golden oolite of Keera bill, brown oolite 
of Jooria, grayish yellow marl rock of Jumara), 
„ tumidum, Bein, (golden oolite, Keera hill). 
„ Polyphemus, Waagen, n, sp. (common in the brown oolite of Lodai, 
Jooria and N. of Goodjinseer, very rare in the golden oolite of 
Keera hill). 
„ lamellosum. Sow. (golden oolite, Keera bill; ? yellow sand rock, N. of 
Dhosa). 
„ Chareeense, Waagen, n. sp. (golden oolite, Keera bill; yellow marl 
rock, Jumara). 
„ Grantamnn, Opp. (same rocks and localities as the preceding sp.; 
also in a sandy iron rock at Kaora, Putchum). 
„ elephantinum. Sow. (brown oolite, Lodai). 
„ arenosum , Waagen, n. sp. (same rock and locality). 
„ / Maya, Sow. (red iron rock, Kuntkote). 
